The parents devoted themselves to keeping their son alive and searching for a cure. But doctors and the families of other ALD patients often refused to take them seriously. They thought the efforts to find a cure were a waste of time，and drug companies weren't interested in supporting research into such a rare disease.

　　However，the parents still refused to give up and spent every available hour in medical libraries and talking to anyone who would help. Through trial and error，they finally created a cure from ingredients (调料) commonly found in the kitchen. The cure，named "Lorenzo's Oil"，saved the boy's life. Despite the good results，scientists and doctors remained unconvinced. They said there was no real evidence that the oil worked and that the treatment was just a theory. As a result，some families with ALD children were reluctant to try it.

　　Finally，the boy's father organized an international study to test the oil. After ten years of trials，the answer is：the oil keeps ALD children healthy.

5.Doctors said that Lorenzo might die within three years because_________.

A.they had never treated the disease before

B.Lorenzo was too young to be cured

C.no cure had been found for ALD

D.ALD was a rare disease

答案　C

解析　细节理解题。根据第一段第二句"Doctors explained that there was no cure for ALD，and that he would probably die within three years."可知医生说Lorenzo在三年内可能会死，是因为ALD还没有治愈的方法。

6.The families of other ALD patients thought that___________.

A.the research for the new cure would cost too much money

B.the efforts of Lorenzo's parents were a waste of time

C.Lorenzo's parents would succeed in finding a cure

D.Lorenzo's oil was a real cure for ALD

答案　B

解析　细节理解题。根据第二段中的"But doctors and the families of other ALD patients often